Trolley-carriage.



J. R. McGlFFERT! TROLLEY CARRIAGE. APPLICATION man JAN. 12. m5.

Patented Dec. 3, 1918.

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JOHN R. ivreerrrnn'r, or DULUTH,

DULUTH, MINNESOTA,

MINNESOTA, Assrenon TO CLYDE A CORPORATION or MAINE.

IRON -WORKS, OF

TROLLEY-CARRIAGE.

To all whom it may concern; I

Be it known that I, JOHN R. MoGIrrnRT,

a citizen of the United States, and a resident of Duluth, county of St. Louis, and State of Minnesota, have invented a new and use.

ful Improvement in Trolley-Carriages, of which the following is a specification, the principle of the invention being herein explained and the best mode in contemplated applying that as to distinguish it from other principle, so inventions.

The present invention relates to a trolley carriage for use with an overhead cableway and is designed to provide which will eliminate much of the wear which at present falls upon the various ele-' ments of such a device. 7 To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claims. The annexed drawings and the following description set forth in detail certain mechanism embodying the invention, such disclosed meansconstituting, however, but one of various mechanical forms in which the principle of the-invention may be used.

In said annexeddrawings:

Figure 1 is a side elevationshowing my improved carriagein connection with an overhead cableway; Fig. 2 is an enlarged side-view of the carriage alone; Fig; 3 is an end viewof the carriage looking from the right in Fig. 2, and Figs; 4 and 5 are side elevations of the main sheave and the V ratchet disk, respectively, showing adjacent provided at its sides of the same when inoperative relation. In Fig. 1 there is shown the usual trolley cable 1 upon which'is mounted the trolley carriage'comprising spaced plates 3 and 4, held in such relation by any suitable means. At the upper corners of the frame of -th'e carriage there are mounted small sheaves or rollers 5 and 6, whichsupport the carriage upon the trolley cable. Centrally mounted in the frame upon a pin 7 is the main sheave 8 about whicha skidding cable 143 is passed several times, such cable then dependingfrom the sheaveandbeing outer end with chokers' 10 for attachment to a log. In case the device is used for other than, logging. purposes,

other suitable engaging elements will be used on the end of the skidding cable. The

sheave 8 is provided with a plurality of Specification of Letters Patent.

which I have a mechanism Patented Dec. 3, 1918.

Application filed January 12, 1915. Serial No. 1,774.

spaced peripheral notches 11 and such notches are adapted to be engaged by a piv oted pawl or latch 12 which is actuated into such engagement by means of a spring 13. When the pawl 12 one of the notches 11 in this sheave 8, this sheave is restrained from what may be termed unwinding rotation, that is rota-- tion in a 01001 wise direction, as the sheave is viewed in the several figures. Mounted concentrically with the sheave 8 is a disk 14 which is also provided with a plurality of notches 15 which in position andsize are similar to the notches 11 in the sheave. This disk is provided with a slot 16 in which a tongue 17 of the sheave is engaged, the tongue being smaller than the slot thus giving the disk a certain rotating capacity with respect to the sheave. When the sheave is turned in the clock-wise direction the tongue engages the left side of the slot'and the notches in the disk and sheave are then in register and may be engaged by the pawl to prevent unwinding rotation of the sheave. When. the sheave is moved in a counter clock-wise direction it leaves the disk. be-. hind during the first notches are then brought out of register and a continuous periphery is presented to the pawlso that the latter does-not drop down into each notch as the sheave is rotated. I

.Attached to a cle-vis 20 mounted in the front side of the frame is an outhaulcable 21 which passes over a suitable sheave at the forward end of the trolley cable and is then brought back to a winding drum'40. .Pivotally mounted between the plates -atth e rear of theyframe is an arm or member 25 provided with a plurality this plate is connected by means of rods 27 with ears 28'which extend downward from the pawl 12. In one of the .apertureson the plate there is attached'the outer end of the is in engagement with movement: and V the r of holes 26 and understood that the drums 40,42 and 50 represent diagrammatia cally the drums usually placed upon a car or base and may be operated by anydesired means- Y x v Mounted above the arm 25 is a small sheave 30 adapted to guide the skidding cable43 on to-the main sheave 8. On the lower edge of each plate of the frame'there I tably the ends of these two liners there are rotamounted small rollers 45 which are for.

the purpose of preventing contact between the skidding cable and the sharp edges of the frame in case the skidding cable 18 -moved to an abnormal backward or forward V The operation is height. cable is released, the pawl is again actuated "is held. against position.

From the foregoing description the construction of the mechanism will be clear;

as follows. I 'When the trolley carriage is mounted upon the inner end of the tro ley cable 1 the outhaul cable 21 is woundin, causing the carriage. to recede and thus drawing out with itthe skidding cable 43 and the buggy cable 41. The carriage is run somewhat beyond the point at which the load is tobe picked up, in order to secure the desired amount of slack in the skidding cable, which is accomplished by hauling in the carriage with the buggy line until it is over the load. When the buggy cable is thus actuated to draw back the carriage it disengages the pawl 12 and thus permits unwinding rotation of the main sheave so that the skidding cable may now be tors and attached to the load. It is neces sary to maintain this tension on the buggy cable in order to prevent the weight of the outhaul cable from acting on the carriage to move the same outward, which would take up part of the slack on the skidding line. When the skidding cable has been secured to the load, the buggy cable is released and the skidding line is then drawn in, the outhaul cable being held taut by means of a brake until the load is raised to the desired As soon as the tension of the buggy to engage the notches-in the sheave audaccordingly when the skidding line has been drawn in and the load raised, the pawl will engage the notches in the sheave. The out haul cable is now released and the carriage is hauled in by pulling on the skidding cable. At the same ,time the buggy cable is drawn in at the same speed as although allowed to run slack without talc ing up the load. In order to lower the logs the drum 40 operating the outhaul cable 21 movement by a brake, here illustrateddiagrammatically at 51, thus preventing further movement of the carriage. The drums 42 and 50continue their winding,

however, thus slightly elevating the load and taking the pressure off the latch or dog 12 which is simultaneously disengaged by the pull on cable lzl- Tl'lG load may then be lowered. L

One importantadvantage of my invention is its safety of operation. 7 In many cases this type of a carriage is used in mountain work "in handling logs down a slope. In many of the carriages now used the load is proved carriage, v the outhaul cable merely permits the ca-r.

' running drawn out by the opera the skidding cable, 7

locked to the carriage and if the outhaul cable breaks,the'carriage and. load will run down" the trolley with, of course, great danger to the machine and the men at the lower end of the cableway. In my imhowever, the breaking of riage tomove faster than the rate of winding of the skidding cable, permitting this cable to slacken and thus slip around the sheave with the result that the load falls to the ground. e 7

By the presen mechanism the load on the cables and the power required, are much reduced although the operatingeffectiveness is increased. e 4 i Othermodes of applying the principle of my invention may be employed instead of the one explained, change being madeas regards'themechanism herein disclosed, providedthe'means stated by any of the following claimsor the equivalent of such stated means'be employed.

I therefore particularly point out and distinctly claim as my invention r 1. In a trolley carriage, the combination with a frame and supporting rollers there for, a sheave mounted in said frame and adapted to movably support a skidding cable passing thereover, of means adapted to prevent unwinding rotation of said sheave, said means including a member mounted rotatably and concentrically with said sheave, and a latch adapted to engage with said member'andsaid sheave when in a prede termined relation. 1 2. In a trolley carriage, the combination with a frame and supporting rollers therefor, a sheave mounted in said frame and adapted to movably support a skidding cable passing thereover, a circular member mounted rotatably and concentrically with said sheave, said sheave and said member having equally spaced peripheral notches, and a latch-member adapted to engage in notches in said sheave and member when such notches are in register.

3. Ina trolley carriage, the combination with a frame and supporting rollers therefor, a sheave mounted in said frame and adapted to movably support a skidding cable passing thereover, a circular member mounted rotatably and concentrically with said sheave, said sheave and said member having equally spaced peripheral notches, a pivoted latch member adapted to be normally pressed against the notched surfaces of said sheave and said member and to engage in such notches when in register, and a buggy line attached to said latch and gage the same from such notches when placed under a'predetermined tension' p 4. In a trolley carriage, the combination with a frame and supporting rollers therefor, a sheave mountedin said frame and adapted to dise 1 provided with peripheral notches, a disk mounted adjacent to said sheave and provided with similar peripheral notches, said disk being slightly rotatable with respect to said sheave, and an outhaul cable, attached to said frame, and a skidding cable wound about said sheave, of a pawl adapted to engage the notches in said disk and said sheave when the same are in register and to thereby prevent unwinding rotation of said sheave, a plate pivotally attached to said frame, connections between said pawl and said plate and a buggy line attache-d to said plate and adapted to actuate the same When'placed under tension.

5. In a trolley carriage, the combination with a frame and supporting rollers there-- for, a sheave mounted in said frame and provided with peripheral notches, a disk mounted adjacent to said sheave and provided with similar peripheral notches, said disk being slightly rota-table with respect to said sheave, and an outhaul cable attached to said frame, and a skidding cable wound about said sheave, of a pawl adapted to engage such notches of said disk and sheave when the same are in register, resilient means normally maintaining said pawl in such engagement, a plate pivotally attached to said frame connections between said plate and said pawl, and a buggy line attached to said plate in position to actuate the same and thereby release said pawl when said line is placed under tension greater than the tension of said resilient means. 7

Signed by me, this 9th day of January, 1915.

JOHN R. MOGIFFERT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

